﻿/************************************************************************

   Extended Silverlight Toolkit

   Copyright (C) 2010-2012 Xceed Software Inc.

   This program is provided to you under the terms of the Microsoft Public
   License (Ms-PL) as published at http://extendedsilverlight.codeplex.com/license

   Please purchase a commercial version of this toolkit if you are using
   it in a commercial product. The commercial versions support the project,
   and also include more features for each control, priority support,
   source code, updates, removed watermark, and a proprietary license.

   Visit http://xceed.com and follow @datagrid on Twitter.

  **********************************************************************/

using System;
using System.Collections.Generic;
using System.Windows.Threading;

namespace Xceed.Silverlight.Data
{
  internal sealed class SafeGroupHeadersFootersSelector : IGroupHeadersFootersSelector
  {
    #region Constructor

    internal SafeGroupHeadersFootersSelector(
      IGroupHeadersFootersSelector selector,
      Dispatcher dispatcher )
    {
      if( selector == null )
        throw new ArgumentNullException( "selector" );

      if( dispatcher == null )
        throw new ArgumentNullException( "dispatcher" );

      m_selector = selector;
      m_synchronizationContext = new DispatcherSynchronizationContext( dispatcher );
    }

    #endregion

    #region UnsafeSelector Internal Property

    internal IGroupHeadersFootersSelector UnsafeSelector
    {
      get
      {
        return m_selector;
      }
    }

    private IGroupHeadersFootersSelector m_selector;

    #endregion

    #region IGroupHeadersFootersSelector Members

    bool IGroupHeadersFootersSelector.HasHeaders( DataPath dataPath )
    {
      return m_synchronizationContext.InvokeFunc( m_selector.HasHeaders, dataPath );
    }

    bool IGroupHeadersFootersSelector.HasFooters( DataPath dataPath )
    {
      return m_synchronizationContext.InvokeFunc( m_selector.HasFooters, dataPath );
    }

    IEnumerable<object> IGroupHeadersFootersSelector.GetHeaders( DataPath dataPath )
    {
      return m_synchronizationContext.InvokeFunc( m_selector.GetHeaders, dataPath );
    }

    IEnumerable<object> IGroupHeadersFootersSelector.GetFooters( DataPath dataPath )
    {
      return m_synchronizationContext.InvokeFunc( m_selector.GetFooters, dataPath );
    }

    IEnumerable<DataPath> IGroupHeadersFootersSelector.GetExceptionHeaders()
    {
      return m_synchronizationContext.InvokeFunc( m_selector.GetExceptionHeaders );
    }

    IEnumerable<DataPath> IGroupHeadersFootersSelector.GetExceptionFooters()
    {
      return m_synchronizationContext.InvokeFunc( m_selector.GetExceptionFooters );
    }

    #endregion

    #region Private Fields

    private DispatcherSynchronizationContext m_synchronizationContext;

    #endregion
  }
}
